The procedures in this chapter guide you through upgrading the Sentinel appliance. You can either choose to upgrade Sentinel without upgrading the SLES operating system or upgrade both Sentinel and the SLES operating system. Since Sentinel 8.2 appliance includes SLES 12 SP3, the SLES 11 updates channel is now deprecated and will be removed when SUSE ends general support for SLES 11. Therefore, you should upgrade to Sentinel 8.2 appliance, which includes SLES 12 SP3 operating system to continue receiving Sentinel and operating system updates. You need to upgrade to Sentinel 8.2 before you upgrade the operating system.